Portable monitor



FIG. 1 is a front, right side perspective view of a portable monitor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another side view thereof.

The broken lines in the drawings represent portions of the portable monitor and form no part of the claimed design. The other broken lines in FIG. 8 are included to show environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a portable monitor, as shown and described. 